Charles bonnefond



MILL.

No. 525,582. Patented Sept. 4, 1894.

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UNITED STATES CHARLES BONNEFOND, OF PARIS, FRANCE, ASSIGNOR TO LA COMPAGNIEn PATENT OFFICE.

FRANCAISE DE MATERIEL DE CHEMINS DE FER, OF SAME PLACE.

MILL.

SPECIFICATION forming' Part of Letters Patent No. 525,582, dated September 4, 1 894.

Application led August 22, 1893. Serial No.'483,'787. (No model.) i Patented in France May 27, 1992,1Io. 221,925, and in Y Belgium July 11, 1892, No. 100,482.

To all whom it may concern.-

Beit known that I, CHARLES BONNEEOND, a citizen of France, residing at Paris, in the Department of the Seine and Republic of France, have invented 'certain new and useful Improvements in'Mills; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such' as will enable others skilled in the art to which it appertains to make and use the same.

The said invention has been already patented in France by Letters Patent No. 221,- 925, dated May 27, 1892, and in Belgium by Letters Patent No. 100,482, dated July ll,`

The new mill with metallic grinding and bolting surfaces for which I make application for Letters Patent is based in a certain measure on the same principles as the one' bodying my invention. Fig. 2 is a plan view vof the lower stone or fixed plate.' v

The form of the apparatus is the same no matter if it should serve one or both purposes mentioned.

The pillars or standards of cast iron Z forming one piece with'a common base L support a box C .of conical shape, covered with a bulged head or lid K provided with a hopper E. A vertical shaft V in the center of the apparatus is guided in two bearings D and D while the lower end rests in a step bearing o. On the upper extremity of the shaft V the grinding plate p p in revolving is keyed; the said plate supports the grinding rings which constitute the running stone. Motion is imparted to the shaft by means of a belt pulley R.

Y The step bearing o rests on a lever X the free end of which is hung on the vertical spindle of the hand wheel soso that it can be lifted or lowered by turning the hand wheel thereby modifying the distance between the upper' revolving plate p p and the lower stationary plate P. The two portions p (the middle) and p (the outer ring) are connected together by arms which produce during the revolution a current of air which by blowing between the grinding surfaces accelerates the passage of the goods and prevents heating.

The lower plate P is supported on three pins c'screwed into three fixed arms cast with the box C and projecting therefrom; it is supported in the center by the bearing D, and rubber washers are interposed so as to give elasticity to the plate and to admit of Vthe passage of hard foreign bodies between the grinding rings.

I shall now consider the features of nov-v p; but the lower central ring A is attachedv Y on a central plate Q, separate from the plate P which carries the outer grinding ring A. This'plate Q is supported by three vertical rods f guided at the top by the arms B and fixed at the bottom in a circular plate F.

vRubber rings are likewise provided between these rods and the plate Q, a sieveT is spread over the annular space between the plates P and Q about flush with the grinding rings A A it is divided in two zones by a circular partition t which leaves between its lower edge and the sieve a narrow passage so that the material driven by the current of air is obliged to crowd between the partition and the bolting surface, thus insuring a perfect sifting. Rakes or Scrapers fixed to the upper revolving plate accelerate, the passage of the material over the sieve T. The exterior rings A and a have of course a dressing finer than A and a', their object being to grind finer. The products escaping from between them ICO ' and a, A are variable independently from one fall mixed into the conical box C and come out by the lower mouth N. Then an elevator leads them to an extractor which extracts the groats fit to be worked down, and delivers into bags the iiour resulting from the bruising or breaking while the bran is thrown back, passing into another receptacle. l

In order to inspect the successive work of the two pairs of rings, an opening has been provided in the sieve T which can be uncovered by passing the hand through the open'-v ing G; when the sample is not satisfactory the adjustment is modied till the evil is. remedied.

The distances of `the grinding =rings a A v another; to modify the adjustment between A a it is sufficient, as A is fixed, to raise or to lower the upper plate p p keyed on the shaft V by raising or lowering its step bearing 'u by means of ahand wheel m. Then the distance between a and A' can be modified by acting through the medium of the hand wheel y on the lever Y which raises or lowers the crown Fand the rods f supporting the plates Q and the rings A The apparatus represented in Fig. l can also operate the line grinding of the grits resulting from the operation of bruising, without submitting it to any modication.

In order to pass from bruising to fine grinding it is sufficient to stop the ingress of the cereals in the central funnel E and the tube e and to pass the granular residue to be ground into the auxiliary funnel E', which will discharge it onto the circular plate M, from whence, by the action of centrifugal force, it will be distributed to the circumferential portions of the outer grinding ringsA ct. The regulation of this distribution of the material will'be elected with extreme simplicity by moving the lower extremityof the hopper E toward or from the lplate M by` means of the screw uponthe stem thereof, which will admit of the ready elevation or` lowering of the same. The grits are chased The products coming out at N under the conical box C are lifted up to a bolting divider where the ilour is separated from the grits not yet reduced; the latter are given up again into the hopper E'.

A sheetguard k, fixed on the crown p pnvents the treated material fromrpassing ol' 6o escaping over the edge of the grinding ring a.

It will be understood from the above doscription that an apparatus as described with respect to Fig. 1 can be used successively by intermittent periods for the bruising of grain and then for the fine grinding ofthe grits rosulting fromthebruising, &c.

Having now described the invention, il claimv Y 1. In combination with a pair of grinding )o faces a sieve arranged inthe `plane of; action of the said faces'and a circular partition arranged slightly `above the said sieve substan-` :tially as set forth.

Yspace between thesaid pairs, anda circular partition also in the said space but sligh t above the said sieve substantially as sat fo 3. In combination with Athe lower lgrindin g rings AA the upper movablegrinding rings a a', the screw threaded rods hiv. :ing hand wheels a: y for adjusting the latter;

rings independently to regulate the'fuen.

lof the grinding, the lever X acted on by hands,

wheel w and supporting the upper grinding ring a and the lever I which is Vacted on `=the hand wheel y'and supports 4the ring-' substantially as set `forth.

4. In lcombination with the centrallylrlgn ranged main hopper E and the easingwhillll supports the same, the hopper ,E also ported by said casing, but discharging im In testimony whereof` I aiiix my signature me in presence of two witnesses.

CHARLES BONNEFOND.

Witnesses:

RoB'r. M. HooPER, LoUIs LOGHERT. 

